Perkins 900 Series Workshop Manual page 85

4
900 Series
To inspect Operation 4-11
1 Check the piston for wear and other damage.
2 Check that the piston rings are free to move in their grooves and that the rings are not broken.
3 Remove the piston rings, see Operation 4-10, and clean the piston ring grooves and the piston rings.
4 Fit new piston rings in the grooves in the piston and check for wear of the grooves with feeler gauges (A).
Compare the piston ring clearance in the groove to that given for new components in the relevant Data and
dimensions for "Pistons and connecting rods" on page 16. Renew the piston, if the grooves are worn too much.
5 Clean all carbon from the top of the cylinder liners. Fit each of the piston rings in the top part of the cylinder
liner and measure the ring gap with feeler gauges (B).
6 The coil spring must be fitted to the oil control ring when the gap of this piston ring is measured. The piston
ring gaps for new components are given in the relevant Data and dimensions for "Piston rings" on page 16.
A B
C0049 C0050
Workshop Manual, TPD 1345E, issue 3 75
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